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116% Wright <br /> Environmental <br /> Services, Inc. <br /> Construction ♦ Engineering ♦ Remediation <br /> N <br /> June 21, 2000 <br /> City of Tracy <br /> 520 Tracy Boulevard co <br /> Tracy, CA 95376 <br /> Attn.: Mr. Paul Verma <br /> Re: Groundwater Monitoring Well Installation and Monitoring, <br /> Tracy Auto Stereo, 10 West Grantline Road, Tracy, CA <br /> Wright Project No. 4184; PHS EHD Site Code 504834 <br /> Dear Mr. Verma, <br /> Wright Environmental Services, Inc. (Wright) is pleased to provide you with this workplan <br /> for installing and monitoring one groundwater well at the above referenced site located at <br /> 10 West Grantline Road, Tracy, CA (see Figure 1). As you know, the purpose of this <br /> work is to provide one well for monitoring depth to groundwater and petroleum <br /> contaminants in groundwater as required by the San Joaquin County Public Health <br /> Services Environmental Health Division (PHS EHD) in their letters dated January 26, 1998 <br /> and May 17, 2000. <br /> Wright has discussed the initial investigation approach presented in our letter dated May 23, <br /> 1997 with the PHS EHD, and agreed upon a reconnaissance approach to ascertain current <br /> site conditions prior to installing any monitoring wells. <br /> Background Summary <br /> Wright removed five underground storage tanks from the site on October 23, 1993. the <br /> tanks included: Tank 1, 90-gallon; Tank 2, 300-gallon; Tank 3, 280-gallon; Tank 4, 18- <br /> gallon and Tank 5, 18-gallon. Tanks 4 and 5 were part of the associated piping for Tanks <br /> 2 and 3. The tanks had apparently been used for gasoline storage. Tank 2 had holes in it <br /> and soil contamination was evident at the time of removal. Groundwater occurred roughly <br /> 8- to 10 feet below the surface. Approximately 190 cubic yards of contaminated soil was <br /> excavated, and 3225 gallons of groundwater pumped from the excavation. Analytical <br /> testing showed that Total Petroleum Hydrocarbons as Gasoline (TPHG) was detected in <br /> soil and groundwater samples, and Total Petroleum Hydrocarbons as Diesel was not <br /> detected in any sample. Following the soil excavation, the curbs were relocated due to <br /> widening of Grantline Avenue. <br /> During the removal of T- through T-5, Wright was informed by the property owner that the <br /> City acquired the property for widening Grantline Road and tanks were not known to have <br /> been present. Also the property owner reported two additional tanks had been removed at <br /> an earlier date from the east side of the building. <br /> 67 E. 10th Street ♦ Tracy, CA 95376 <br /> 209.833.0758 ♦ Fax 209.832.5152 <br /> wright@inreach.com Lic. 4651301 A-B HazMat Page 1 <br /> websit hitp.//home.inreach.com/wright <br />